Perhaps courtrooms deserve to practice the “Hollywood exception” to the safety rules. You can’t, however, suggest that exercising the “Hollywood exception” is “perfectly safe”. Alec Baldwin proved that it isn’t perfectly safe.
The problem with that movie was that their weapon/ammunition inventory control was inherently dangerous. And of course, Baldwin should have checked the weapon himself. And if he did, there wouldn't have been an accident.
In this case, as much as I hate the prosecutor, it seems like we're trying to make a lot out of a little. We can see there is no magazine. None of us know -- because we weren't there -- if that chamber was checked and shown to be empty in full view of the lawyers, jurors, and bailiff. If it was...then pointing it in a direction away from the jurors as a demonstration is completely safe.
We have so many perfectly valid criticisms of this prosecutor that it weakens those criticisms to add one that may not be valid at all.